Heap Requirements for Graphics Objects

This page contains information for the Graphics Library found in Microchip Libraries for Applications (MLA). It is not relevant for the MPLAB® Harmony Graphics Library.

Memory Requirements for Graphics Applications

	MPLAB XC16 Compiler			MPLAB XC32 Compiler
Graphics Component	Flash	RAM	Heap	Flash	RAM	Heap
Primitive Layer	3285	66	0	8868	53	0
Graphics Object Layer Overhead	2124	32	20 per Style Scheme	5400	28	28 per Style Scheme
Button	1131	38	8 per Instance	2748	12	44 per Instance
Check Box	1008	2	8 per Instance	2320	4	36 per Instance
Radio Button	1114	14	26 per Instance	2632	20	44 per Instance
Slider/Scroll Bar	2352	20	32 per Instance	5720	24	44 per Instance
Static Text	792	8	22 per Instance	1884	12	36 per Instance
Progress Bar	1072	12	24 per Instance	2452	16	32 per Instance
Group Box	960	8	24 per Instance	2124	12	36 per Instance
Window	807	2	24 per Instance	1996	4	40 per Instance
List Box	2094	6	28 per Instance	2580	12	44 per Instance
Edit Box	1008	2	26 per Instance	2332	4	40 per Instance
Meter	2520	42	40 per Instance	6788	40	68 per Instance
Box	1092	8	32 per Instance	3228	12	40 per Instance

All memory requirements are in bytes.

Calculating the Required Heap Size

Most of the graphical components require some amount of memory set aside for the heap. Just how much is needed is determined by adding the memory requirements of each component module in the created routine. The overhead of the Graphics Object Layer is always included along with the requirements of each instance of the objects used.

Example

For a PIC32 application which utilizes one style scheme and has one screen, which contains:

Six button objects
One dial object
Two Meter objects

and requires the following memory (in bytes):

	Flash	RAM	Heap
Graphics Object Layer Overhead	5400	28	28
Button Objects (6X)	2748	12	266	= 44 bytes/Button X 6 Buttons
Dial Object (1X)	3228	12	40
Meter Object (2X)	6788	40	136	= 68 bytes/Meter X 2 Meters
			466	Bytes needed for heap

Return to Top